ICD-10 Code B05.9 – Measles without complication (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B05.9 – Measles without complication
What it is
B05.9 identifies measles when the diagnosis is confirmed but no specific complication is documented. Use it for the uncomplicated viral illness caused by measles virus.
Clinical signs
Typical findings include fever, cough, coryza, conjunctivitis, and a characteristic maculopapular rash. Koplik spots may be present, but clinical features vary; refer to documentation.
When to use this code
Use B05.9 when the record states measles and does not describe encephalitis, pneumonia, otitis media, or another complication. It also fits when the provider documents a routine, uncomplicated case. If the note is unclear, check documentation before assigning the code.
Do not use for
Do not use this code if measles is documented with a complication or if the chart specifies a different measles code. Do not assume “measles” alone means uncomplicated when the record adds organ involvement.
Coding tip
Code B05.9 only when the provider clearly documents measles without complication; otherwise, query for the specific manifestation.